Bushing retainer for rotary-drill tables



Nov. 27 1923. 1,475,3 0 L. E. ZERBE,

BUSHING RETAINER FOR ROTARY DRILL TABLES Filed Feb. 20. 1922 1,475,360 Fin.

LEWIS E. ZEEEBE, Q KON'ETA, CALIFOR'NHA, ASsIGNdR T0 UNION TOOL COMPANY, 0 TOBBANCE, CALIFGBNXA. A. CORPORATION OF CALIFORNIA.

BUSHIEG RETAINER FOR ROTARY-DRILL TABLES.

Application f led February 20, 1922. Serial No. 538.059.

1 all whom it may concern:

. Be it known that I, LEWIS E. Znsns, a citizen of the United States, residing at iilonetu. in the county oi Los Angeles and State of (,zilii'oruiu, have invented a new and useful liushinp Retainer for Rotary-Drill Tables, of which the following 2, specificntion.

This invention relates to o bushing re tuiner for rotar object, to provi en means preventing a verticzil displacement of the bushings.

Another object is to provide a means for preventing: a. vertical displacement of the drill-stem bushings and table bushings during: an upward translation of the drill stem.

Another object is to provide a means which will prevent the bushings becoming displaced through {a chattering of the bushings during it drilling operation.

A further object is to provide a device for preventing vertical displacement of the table busl'iings during a pipe pulling operation, without interfering with 2:. free ma. nipulation ohthe pipe slips. 7

Variousother ob'ects and advantages will be more fully apparent from the 'following description and the accompanying draw ings which form a part of this disclosure. and which illustrate a. preferred form of embodiment of the invention.-

Of the drawings:

Fig. l 51 perspective View of a rotary drill table. with in}; bushing retainer so plied thereto. I

F 2 is a plan view, partly in section. 0

fig. 3 is :1 section on line 3-3 of Fig. 4- is an elevation of the retaining 7 looking at 'ltS side edge.

In the drawings, 1 designates the rotary drill table which may be of any well lrnown or standard design, said table having the usual central throat opening 2 formed to receive the split table bushings 3 which are formed with squared flanges countersunk into the table surface to prevent their turning in the throat.

Engaging within the table bushings 3 are split drill-stem bushings {it having squared flanges countersunk into the surface of the rsble bushings 8, the bushings forming a square bore in which the drill-stein (not,

shown) engages.

The above general type or construction is now so Well known in ills that iurther drill tables and has for an detailed description thereof is herein unnecessary, it being sulficient/ for the purpose of the present disclosure to stife that in s. drilling operation with the drill stein positioned within the bore of ihe bushings i, a rotation oithe table will rotate the drill stein while at the some time-permit a ver' ticsl translation t iereof.

in withdrawin the drill stem from the well bore, the drill stem bushings 4 are re moved and when desired to withdraw the drill pipe suitable pipe slips are employed in conjunction with the table bushings in the usual manner.

It has been found that in a. drilling op oration a chattering of the drill stem will likewise cause a chattering of the drill-- stem bushings with the result that they have a tendency of creeping upwardly until their squared flanges are entirely free of the table bushings, and in such instance their driving function is interrupted and they he come so displaced as be cause serious dam age to the equipment.

To prevent such displacement of thedrillstein bushings and to further prevent upward movement of both the drill-Shem bushings and table bushings at any time While in use. or to prevent an upward movement. of only the table bushings when the drillstem bushings zire not being employed, as for instance in a. pipe drawing operation, I hav provided means. for pi eventin upword movement of the bushings untfsuch means is first withdrawn front the path of? withdrawal of the bushings.

b'uch means comprises a keeper whici'z. may be in the form of a retaining plate 5m". approximate U-shape and I provide guiding means for the keeper receiving its opposes? limbs slidably in slidewnys formed by opposed brackets 7 secured by bolts 8 to th: surface of the rublel' upon opposite sides of the table throat opening 2. The plate is provided with stop abutments 9 adapts to engage the respective brackets 7 to llll'llz' the inward movement of the plate 5 and as a means for locking the plate in its inner position I provide lock studs 10 each engaging through relatively alined apertures 11 in the respective brackets 7. and apertures 12 in the table surface and passing through .2. recess 13 in the respective edge of the plate.

The, plate is provided, with 2r hendlel to that when the plate is in inner position as shown in Figs. l and 2, it not only overlaps the table bushings 3 but also will overlap the outer corners of the drill-stem bushings 4 when such bushings are in use.

This construction provides a horizontally slidable retaining plate or slide adapted to be moved to a position overlapping the table bushings to prevent their removal or displacement and which locked in such position until released for subsequent removal from above the .bushings' to permit a renioval of the bushings hile the form of device herein illustrated and described is well adapted for the purposes primarily stllted, it is to be understood that I do not wish to confine the invention tothe one form of embodiment here- -in disclosed for it is susceptible of embodiment in various other forms all coming within the"'s'cope of the claims which follow.

I claim:

"1. In a device of the nature disclosed, the combination of a rotary drill table having vertically removable bushings, movable keeper means, and means for guiding the same into a position to prevent a removal of the bushings.

2. In a device of the nature disclosed, the combination of a rotary drill table having vertically removable bushingaslideways on opposite sides of said bushings. and a retaining in mber engaging said slidevvays and movab e to a position to overlap the bushings and prevent their removal.

3. In a device of the nature disclosed, the combination of a rotary drill table having vertically removable bushings. and means movable to a position to prevent a removal of the bushings, and means locking the retaining member against with'draival.

4. In a device of the nature disclosed, the combination of a rotary drill table having vertically removable bushings, horizontal slideways on opposite sides of said bushings, a retaining slide engaging said slideways and movable-to a position to overlap the bushings and prevent their removal,

means limiting the inward movement of said slide, and means locking the slide in its inner position.

5. In a device of the nature disclosed, the combination of amrotary drill table having within said throat, drill-stem bushings engaging within the table bushings, horizontal slideways on the table, and a retaining plate slidable in said slideways to a position to overlap the bushings and prevent their removal.

6. In a device of the kind described, the combination of a rotary drill table with a central opening, table bushings received in said opening and having 'flanges'supported on the table, drill stem bushings received in the opening of the table bushings and having flanges resting on the table bushings and supporting the drill stem bushings, and re- Il'lOVlll'Jll-E means attached to the table for engaging the drill stem bushings to prevent their upward displacement, the drill stein bushings operating to prevent vertical (lisplacement of the table bushings.

7'. In a device oi the kind described, the combination of a rotary drill tablohaving a central opening, a split table bushing composed of two table bushing sections received in the said opening, a split drill stem bushing composed of two bushing-sections received in the opening of the table bushings, said table bushings having flanges countersunk into the upper face of the table so that their upper faces are flush therewith and said drill stem bushings having flanges countersunk into the upper faces of the table bushing and flush therewith, and movable mcans for engaging the upper face of the drill stem bushings for holding the same against vertical displacement, said drill stem bushings operating to hold the table bushings against displacement.

Signed at Torrance, California, this 10th day of February, 1922.

D: E. AIKEN.

an a central throat, table -bnshingsengaging 

